Frankie Nwafili stabilized the runtime identifier system within the tokio-rs/tokio repository, focusing on the runtime::id::Id type to enhance API reliability and runtime identification. By removing unstable API markers and enforcing consistent usage of Id across the Tokio runtime, Frankie improved the usability and maintainability of the API for developers working with concurrent Rust applications. The work centered on API development and concurrency, leveraging Rust’s type system to ensure robust runtime identification. This contribution addressed potential API drift and provided a more stable foundation for future development, reflecting a focused and in-depth approach to core runtime infrastructure.